linux/arch/powerpc/boot/libfdt-wrapper.c
Thomas Gleixner cfcf6e707e treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 161
Based on 1 normalized pattern(s):

  this library is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this library is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this library if not write to the free software foundation inc
  51 franklin st fifth floor boston ma 02110 1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.564858142@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:38 -07:00

186 lines
4.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This file does the necessary interface mapping between the bootwrapper
* device tree operations and the interface provided by shared source
* files flatdevicetree.[ch].
*
* Copyright 2007 David Gibson, IBM Corporation.
*/
#include <stddef.h>
#include <stdio.h>
#include <page.h>
#include <libfdt.h>
#include "ops.h"
#define DEBUG 0
#define BAD_ERROR(err) (((err) < 0) \
&& ((err) != -FDT_ERR_NOTFOUND) \
&& ((err) != -FDT_ERR_EXISTS))
#define check_err(err) \
({ \
if (BAD_ERROR(err) || ((err < 0) && DEBUG)) \
printf("%s():%d %s\n\r", __func__, __LINE__, \
fdt_strerror(err)); \
if (BAD_ERROR(err)) \
exit(); \
(err < 0) ? -1 : 0; \
})
#define offset_devp(off) \
({ \
unsigned long _offset = (off); \
check_err(_offset) ? NULL : (void *)(_offset+1); \
})
#define devp_offset_find(devp) (((unsigned long)(devp))-1)
#define devp_offset(devp) (devp ? ((unsigned long)(devp))-1 : 0)
static void *fdt;
static void *buf; /* = NULL */
#define EXPAND_GRANULARITY 1024
static void expand_buf(int minexpand)
{
int size = fdt_totalsize(fdt);
int rc;
size = _ALIGN(size + minexpand, EXPAND_GRANULARITY);
buf = platform_ops.realloc(buf, size);
if (!buf)
fatal("Couldn't find %d bytes to expand device tree\n\r", size);
rc = fdt_open_into(fdt, buf, size);
if (rc != 0)
fatal("Couldn't expand fdt into new buffer: %s\n\r",
fdt_strerror(rc));
fdt = buf;
}
static void *fdt_wrapper_finddevice(const char *path)
{
return offset_devp(fdt_path_offset(fdt, path));
}
static int fdt_wrapper_getprop(const void *devp, const char *name,
void *buf, const int buflen)
{
const void *p;
int len;
p = fdt_getprop(fdt, devp_offset(devp), name, &len);
if (!p)
return check_err(len);
memcpy(buf, p, min(len, buflen));
return len;
}
static int fdt_wrapper_setprop(const void *devp, const char *name,
const void *buf, const int len)
{
int rc;
rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
if (rc == -FDT_ERR_NOSPACE) {
expand_buf(len + 16);
rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
}
return check_err(rc);
}
static int fdt_wrapper_del_node(const void *devp)
{
return fdt_del_node(fdt, devp_offset(devp));
}
static void *fdt_wrapper_get_parent(const void *devp)
{
return offset_devp(fdt_parent_offset(fdt, devp_offset(devp)));
}
static void *fdt_wrapper_create_node(const void *devp, const char *name)
{
int offset;
offset = fdt_add_subnode(fdt, devp_offset(devp), name);
if (offset == -FDT_ERR_NOSPACE) {
expand_buf(strlen(name) + 16);
offset = fdt_add_subnode(fdt, devp_offset(devp), name);
}
return offset_devp(offset);
}
static void *fdt_wrapper_find_node_by_prop_value(const void *prev,
const char *name,
const char *val,
int len)
{
int offset = fdt_node_offset_by_prop_value(fdt, devp_offset_find(prev),
name, val, len);
return offset_devp(offset);
}
static void *fdt_wrapper_find_node_by_compatible(const void *prev,
const char *val)
{
int offset = fdt_node_offset_by_compatible(fdt, devp_offset_find(prev),
val);
return offset_devp(offset);
}
static char *fdt_wrapper_get_path(const void *devp, char *buf, int len)
{
int rc;
rc = fdt_get_path(fdt, devp_offset(devp), buf, len);
if (check_err(rc))
return NULL;
return buf;
}
static unsigned long fdt_wrapper_finalize(void)
{
int rc;
rc = fdt_pack(fdt);
if (rc != 0)
fatal("Couldn't pack flat tree: %s\n\r",
fdt_strerror(rc));
return (unsigned long)fdt;
}
void fdt_init(void *blob)
{
int err;
int bufsize;
dt_ops.finddevice = fdt_wrapper_finddevice;
dt_ops.getprop = fdt_wrapper_getprop;
dt_ops.setprop = fdt_wrapper_setprop;
dt_ops.get_parent = fdt_wrapper_get_parent;
dt_ops.create_node = fdt_wrapper_create_node;
dt_ops.find_node_by_prop_value = fdt_wrapper_find_node_by_prop_value;
dt_ops.find_node_by_compatible = fdt_wrapper_find_node_by_compatible;
dt_ops.del_node = fdt_wrapper_del_node;
dt_ops.get_path = fdt_wrapper_get_path;
dt_ops.finalize = fdt_wrapper_finalize;
/* Make sure the dt blob is the right version and so forth */
fdt = blob;
bufsize = fdt_totalsize(fdt) + EXPAND_GRANULARITY;
buf = malloc(bufsize);
if(!buf)
fatal("malloc failed. can't relocate the device tree\n\r");
err = fdt_open_into(fdt, buf, bufsize);
if (err != 0)
fatal("fdt_init(): %s\n\r", fdt_strerror(err));
fdt = buf;
}